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                    介绍ABOUT
            
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        <li class="header">【第一章】Java基础</li>
        
        
    
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                    计算机基础-操作系统-进程-计算机网络
            
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                    线程池的工作原理
            
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                    集合
            
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                    Map&HashMap&HashTable&ConcurrentHashMap
            
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                    队列-queue
            
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                    java输入输出流
            
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                    Java序列化
            
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                    volatile&synchronized
            
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                    object/wait/notify
            
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                    thread
            
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                    线程池的工作原理
            
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                    lock&ReentrantLock&ReadWriteLock
            
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                    lock&condition
            
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                    Java并发工具- CountDownLatch&CyclicBarrier 
            
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                    Java同步工具类- CountDownLatch&CyclicBarrier&Semaphore  
            
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                    java虚拟机-JVM
            
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                    java7新知识- Switch&TWR&Objects 
            
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                    Java8对集合流操作stream
            
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                    java8新语法-Stream-分组groupingBy操作 
            
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                    java8新语法-Optional 
            
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                    java8-新的日期时间API 
            
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                    XML中特殊符号的转译 
            
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                    Java bean转Map 
            
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                    算法题 - 合并排序数组 
            
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                    算法题 - 最低分数线问题 
            
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                    算法题 - 求数组的子集合 
            
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                    SpringBoot
            
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                    SpringSecurity
            
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                    SpringBoot项目启动脚本
            
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                    Spring面试题68
            
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                    SpringBoot自动装载机制 - 源码分析
            
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                    Feign在spring、springboot下使用
            
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                    Spring boot集成freemarker，生成word文件
            
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                    Freemarker自动生成Java bean代码
            
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                    mybatis中insert/update/delete标签中执行多条SQL语句
            
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                    springboot集成mybatis-plus框架
            
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                    【分布式】sharding-jdbc实现分库分表
            
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                    SQL常用使用
            
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                    redis学习笔记
            
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                    Redis中的队列list实现秒杀活动抢购
            
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                    mysql绿色版安装服务教程
            
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                    H2内嵌数据的使用
            
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                    缓存
            
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                    MySQL单表备份还原
            
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                    web简单积累
            
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                    linux常用命令
            
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                    windows常用命令
            
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                    maven引入依赖时识别不到本地仓库的jar
            
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                    spring security 配置发生错误 Can't configure antMatchers after anyRequest
            
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        <li class="chapter " data-level="25.1" data-path="../error/AOP_stream_close_error.html">
            
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                    AOP内获取了对请求流操作后报流已经关闭错误的问题
            
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        <li class="chapter " data-level="26.1" data-path="../tools/github/github_ssh.html">
            
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                    Github ssh key 解决提交后push频繁输入用户名和密码
            
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                    sharding-jdbc-4.1.1版本启动数据源报错问题
            
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<h4 id="&#x5728;spring-boot&#x73AF;&#x5883;&#x4F53;&#x7CFB;&#x4E0B;&#x4F7F;&#x7528;"><a name="&#x5728;spring-boot&#x73AF;&#x5883;&#x4F53;&#x7CFB;&#x4E0B;&#x4F7F;&#x7528;" class="anchor-navigation-ex-anchor" href="#&#x5728;spring-boot&#x73AF;&#x5883;&#x4F53;&#x7CFB;&#x4E0B;&#x4F7F;&#x7528;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5728;spring boot&#x73AF;&#x5883;&#x4F53;&#x7CFB;&#x4E0B;&#x4F7F;&#x7528;</h4>
<p>&#x7B2C;&#x4E00;&#x6B65;&#xFF0C;&#x5728;maven &#x5F15;&#x5165;&#x4F9D;&#x8D56;&#xFF0C;pom.xml</p>
<pre><code class="lang-xml"><span class="hljs-comment">&lt;!-- &#x7528;&#x4E8E;springboot&#x9879;&#x76EE;&#x73AF;&#x5883;&#x4E0B;&#xFF0C;&#x6216;&#x8005;springcloud&#x9879;&#x76EE;&#x73AF;&#x5883;&#x4E0B; &#x96C6;&#x6210; feign --&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-starter-openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>2.0.2.RELEASE<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
</code></pre>
<p>&#x7B2C;&#x4E8C;&#x6B65;&#xFF0C;&#x7F16;&#x5199;feign&#x5BA2;&#x6237;&#x7AEF;&#xFF0C;&#x76F8;&#x5F53;&#x4E8E;&#x5B9E;&#x9645;&#x8BF7;&#x6C42;&#x63A5;&#x53E3;</p>
<p>&#x53EA;&#x9700;&#x8981;&#x5B9A;&#x4E49;&#x65B9;&#x6CD5;&#x8BF7;&#x6C42;&#xFF0C;&#x7C7B;&#x4F3C;&#x670D;&#x52A1;&#x7AEF;controller&#x7684;&#x8BF7;&#x6C42;&#xFF0C;url&#x914D;&#x7F6E;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;springcloud&#x4F53;&#x7CFB;&#x91CC;&#x9762;&#x5FAE;&#x670D;&#x52A1;&#x914D;&#x7F6E;</p>
<pre><code class="lang-java"><span class="hljs-meta">@FeignClient</span>(name = <span class="hljs-string">&quot;studentFeignClient&quot;</span>, url = <span class="hljs-string">&quot;${student.feign.url}&quot;</span>)
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">StudentFeignClient</span> </span>{

    <span class="hljs-meta">@GetMapping</span>(<span class="hljs-string">&quot;/list&quot;</span>)
    <span class="hljs-function"><span class="hljs-keyword">public</span> ResultUtis <span class="hljs-title">getList</span><span class="hljs-params">()</span> </span>;
}
</code></pre>
<p>&#x7B2C;&#x4E09;&#x6B65;&#xFF0C;&#x5728;&#x542F;&#x52A8;&#x7C7B;&#x4E0A;&#x6CE8;&#x518C;&#x626B;&#x63CF;</p>
<pre><code class="lang-java"><span class="hljs-comment">// &#x5F00;&#x542F; feign</span>
<span class="hljs-meta">@EnableFeignClients</span>
<span class="hljs-meta">@SpringBootApplication</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">FeignLearnApplication</span> </span>{

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> </span>{
        SpringApplication.run(FeignLearnApplication.class, args);
    }
}
</code></pre>
<p>&#x7B2C;&#x56DB;&#x6B65;&#xFF0C;&#x5BA2;&#x6237;&#x7AEF;&#x5B9E;&#x9645;&#x65B9;&#x6CD5;&#x4E2D;&#x8C03;&#x7528;&#x670D;&#x52A1;&#x7AEF;&#x63A5;&#x53E3;</p>
<pre><code class="lang-java"><span class="hljs-meta">@RestController</span>
<span class="hljs-meta">@RequestMapping</span>(<span class="hljs-string">&quot;/student&quot;</span>)
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StudentController</span> </span>{

    <span class="hljs-comment">// &#x5B9E;&#x9645;&#x8C03;&#x7528;&#xFF0C;&#x81EA;&#x52A8;&#x6CE8;&#x5165;</span>
    <span class="hljs-meta">@Autowired</span>
    <span class="hljs-keyword">private</span> StudentFeignClient studentFeignClient ;

    <span class="hljs-meta">@GetMapping</span>(<span class="hljs-string">&quot;/list&quot;</span>)
    <span class="hljs-function"><span class="hljs-keyword">public</span> ResultUtis <span class="hljs-title">getList</span><span class="hljs-params">()</span> </span>{
        <span class="hljs-keyword">return</span> studentFeignClient.getList();
    }
}
</code></pre>
<p>&#x4EE5;&#x5F80;&#x4F7F;&#x7528;Rest Template&#x7684;&#x505A;&#x6CD5;&#xFF1A;</p>
<pre><code class="lang-java">
<span class="hljs-meta">@RestController</span>
<span class="hljs-meta">@RequestMapping</span>(<span class="hljs-string">&quot;/student&quot;</span>)
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StudentController</span> </span>{

    <span class="hljs-meta">@Autowired</span>
    <span class="hljs-keyword">private</span> RestTemplate restTemplate ;

    <span class="hljs-comment">// &#x5B66;&#x751F;&#x670D;&#x52A1;&#x7AEF;&#x63A5;&#x53E3;URL</span>
    <span class="hljs-meta">@Value</span>(<span class="hljs-string">&quot;${student.feign.url}&quot;</span>)
    <span class="hljs-keyword">private</span> String studentServerUrl ;

    <span class="hljs-meta">@GetMapping</span>(<span class="hljs-string">&quot;/list&quot;</span>)
    <span class="hljs-function"><span class="hljs-keyword">public</span> ResultUtis <span class="hljs-title">getList</span><span class="hljs-params">()</span> </span>{
        <span class="hljs-comment">// &#x7C7B;&#x4F3C;</span>
        <span class="hljs-keyword">return</span> restTemplate.getForObject(studentServerUrl + <span class="hljs-string">&quot;/list&quot;</span>, 
                                         ResultUtis.class);
    }

}
</code></pre>
<p>&#x76F8;&#x6BD4;&#x8F83;&#x4E0B;&#xFF0C;feign&#x8BF7;&#x6C42;&#x8BBF;&#x95EE;&#x670D;&#x52A1;&#x63A5;&#x53E3;&#x66F4;&#x52A0;&#x7B80;&#x6D01;&#xFF0C;&#x66F4;&#x52A0;&#x65B9;&#x4FBF;</p>
<h4 id="&#x4E0D;&#x5728;springboot&#x4F53;&#x7CFB;&#x4E0B;"><a name="&#x4E0D;&#x5728;springboot&#x4F53;&#x7CFB;&#x4E0B;" class="anchor-navigation-ex-anchor" href="#&#x4E0D;&#x5728;springboot&#x4F53;&#x7CFB;&#x4E0B;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x4E0D;&#x5728;springboot&#x4F53;&#x7CFB;&#x4E0B;</h4>
<p>feign&#x53EF;&#x4EE5;&#x5728;spring&#x3001;springMVC&#x73AF;&#x5883;&#x4E0B;&#x4F7F;&#x7528;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x5355;&#x72EC;&#x4F7F;&#x7528;&#xFF0C;&#x7C7B;&#x4F3C;  http client</p>
<p>&#x7B2C;&#x4E00;&#x6B65;&#xFF0C;&#x914D;&#x7F6E;maven&#xFF0C;&#x6DFB;&#x52A0;JAR&#x5305;&#xFF0C;pom.xml</p>
<pre><code class="lang-xml"><span class="hljs-comment">&lt;!-- &#x4EE5;&#x4E0B;&#x51E0;&#x4E2A;&#x7528;&#x4E8E; spring&#x73AF;&#x5883;&#x3001;springmvc&#x73AF;&#x5883;&#x4E0B;&#x7684;&#xFF0C;&#x6216;&#x8005; &#x4E0D;&#x662F; spring&#x5BB9;&#x5668;&#x5185;&#x7684;&#x9879;&#x76EE; &#x96C6;&#x6210; feign --&gt;</span>
<span class="hljs-comment">&lt;!-- feign-core &#x662F;&#x6838;&#x5FC3;&#xFF0C;&#x5176;&#x4ED6;JAR&#x7528;&#x4E0D;&#x5230;&#xFF0C;&#x53EF;&#x4EE5;&#x4E0D;&#x7528;&#x5F15;&#x5165; --&gt;</span>
 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-core<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>

 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-gson<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>

 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-jackson<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>



 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-httpclient<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>


 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-okhttp<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>

 <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>io.github.openfeign<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
     <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>feign-ribbon<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${feign.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
</code></pre>
<p>&#x7B2C;&#x4E8C;&#x6B65;&#xFF0C;&#x7F16;&#x5199;feign&#x5BA2;&#x6237;&#x7AEF;&#xFF0C;&#x5B9E;&#x9645;&#x8BBF;&#x95EE;&#x8BF7;&#x6C42;&#x63A5;&#x53E3;</p>
<pre><code class="lang-java"><span class="hljs-comment">/**
 * <span class="hljs-doctag">@description</span>
 *    &#x4E0D;&#x5728;spring&#x73AF;&#x5883;&#x4E0B;&#x7684;  feign &#x63A5;&#x53E3;&#x5B9A;&#x4E49;
 * <span class="hljs-doctag">@author</span> TianwYam
 * <span class="hljs-doctag">@date</span> 2020&#x5E74;12&#x6708;25&#x65E5;&#x4E0B;&#x5348;6:25:42
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">StudentFeignClientNoSpring</span> </span>{


    <span class="hljs-comment">// &#x4E0D;&#x4F7F;&#x7528;spring&#x73AF;&#x5883;&#x4E0B;&#x7684;&#xFF0C;&#x53EA;&#x80FD;&#x4F7F;&#x7528; feign&#x81EA;&#x5E26;&#x7684; RequestLine &#x6765;&#x58F0;&#x660E; &#x65B9;&#x6CD5; &#x8BF7;&#x6C42; &#x7C7B;&#x578B;</span>
    <span class="hljs-meta">@RequestLine</span>(<span class="hljs-string">&quot;GET /list&quot;</span>)
    <span class="hljs-function"><span class="hljs-keyword">public</span> ResultUtis <span class="hljs-title">getList</span><span class="hljs-params">()</span> </span>;

}
</code></pre>
<p>&#x7B2C;&#x4E09;&#x6B65;&#xFF0C;&#x8C03;&#x7528;&#x65B9;&#x5F0F;</p>
<pre><code class="lang-java"><span class="hljs-comment">/**
 * <span class="hljs-doctag">@description</span>
 *    &#x5728;&#x4E0D;&#x662F; spring&#x73AF;&#x5883;&#x4E0B; &#x3001; springboot&#x73AF;&#x5883;&#x4E0B;&#x7684; &#x4F7F;&#x7528;feign
 * <span class="hljs-doctag">@author</span> TianwYam
 * <span class="hljs-doctag">@date</span> 2020&#x5E74;12&#x6708;25&#x65E5;&#x4E0B;&#x5348;6:17:56
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">FeignNoSpringMain</span> </span>{

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> </span>{


        StudentFeignClientNoSpring studentFeignClient = Feign.builder()
            .decoder(<span class="hljs-keyword">new</span> GsonDecoder())
            .target(StudentFeignClientNoSpring.class, <span class="hljs-string">&quot;http://localhost:8081/api/v1/student&quot;</span>);

        ResultUtis list = studentFeignClient.getList();

        System.out.println(JSON.toJSONString(list, SerializerFeature.PrettyFormat));
    }

}
</code></pre>
<p>&#x6B64;&#x5904;&#x5199;&#x6210;main&#x65B9;&#x5F0F;&#xFF0C;&#x5B9E;&#x9645;&#x9879;&#x76EE;&#x4E2D;&#xFF0C;&#x53EF;&#x4EE5;&#x5199;&#x6210;&#x4E00;&#x4E2A;&#x5DE5;&#x5177;&#x7C7B;</p>
<pre><code class="lang-java"><span class="hljs-comment">/**
 * <span class="hljs-doctag">@description</span>
 *    Feign&#x5DE5;&#x5177;&#x7C7B;
 * <span class="hljs-doctag">@author</span> TianwYam
 * <span class="hljs-doctag">@date</span> 2021&#x5E74;1&#x6708;30&#x65E5;&#x4E0A;&#x5348;11:24:21
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">FeignClientUtils</span> </span>{

    <span class="hljs-comment">/**
     * <span class="hljs-doctag">@description</span>
     *    &#x83B7;&#x53D6; feign&#x5BA2;&#x6237;&#x7AEF;
     * <span class="hljs-doctag">@author</span> TianwYam
     * <span class="hljs-doctag">@date</span> 2021&#x5E74;1&#x6708;30&#x65E5;&#x4E0A;&#x5348;11:23:34
     * <span class="hljs-doctag">@param</span> &lt;T&gt; &#x5BA2;&#x6237;&#x7AEF;&#x7C7B;
     * <span class="hljs-doctag">@param</span> url &#x8C03;&#x7528;&#x5BA2;&#x6237;&#x7AEF;&#x8BF7;&#x6C42;&#x7684;URL
     * <span class="hljs-doctag">@param</span> clazz &#x5BA2;&#x6237;&#x7AEF; class
     * <span class="hljs-doctag">@return</span>
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> &lt;T&gt; <span class="hljs-function">T <span class="hljs-title">getClient</span><span class="hljs-params">(String url, Class&lt;T&gt; clazz)</span> </span>{

        <span class="hljs-keyword">return</span> Feign.builder()
                .decoder(<span class="hljs-keyword">new</span> GsonDecoder())
                .encoder(<span class="hljs-keyword">new</span> GsonEncoder())
                .target(clazz, url);
    }
}
</code></pre>
<p>&#x76F8;&#x5BF9;&#x4E8E;httpclient&#x4E0B;&#x65B9;&#x4FBF;&#x8BB8;&#x591A;&#xFF0C;&#x4E0D;&#x9700;&#x8981;&#x590D;&#x6742;&#x7684;&#x53BB;&#x8BBE;&#x7F6E; &#x8BF7;&#x6C42;&#x65B9;&#x5F0F;get\post&#x7B49;&#xFF0C;&#x4E5F;&#x4E0D;&#x9700;&#x8981;&#x5BF9;&#x8FD4;&#x56DE;&#x503C;&#x505A;&#x89E3;&#x6790;</p>
<p>feign&#x662F;&#x76F4;&#x63A5;&#x8DDF;&#x670D;&#x52A1;&#x7AEF;&#x7684;controller&#x4FDD;&#x6301;&#x4E00;&#x81F4;&#xFF0C;&#x5B9A;&#x4E49;&#x8BF7;&#x6C42;&#x65B9;&#x6CD5;&#xFF0C;&#x76F8;&#x5BF9;&#x6765;&#x8BF4;&#x66F4;&#x52A0;&#x7B80;&#x5355;&#xFF0C;&#x66F4;&#x52A0;&#x5BB9;&#x6613;</p>
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